Order type & not allowed

What causes this issue?

Document type &V1& from the transfer file is not defined in the target
system

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Check the document types for ordering in Customizing for Purchasing.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.